Roger Federer was given a point penalty as he followed Novak Djokovic out of the Shanghai Masters quarter-finals in a bad-tempered defeat to Alexander Zverev on Friday.
The 22-year-old German won 6-3, 6-7 (7/9), 6-3 as the Swiss legend Federer was penalised after twice hitting the ball out the court in anger.
The sixth-ranked Zverev faces Austria's Dominic Thiem or Matteo Berrettini of Italy in the semi-finals on Saturday.
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